<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <button id="increment">+1</button>
  <span id="count">0</span>
  <button id="decrement">-1</button>

  <script src="./redux.js"></script>
  <script src="./middlewares/logger.js"></script>
  <script src="./middlewares/thunk.js"></script>
  <script>
    function reducer(state, action) {
      switch(action.type) {
        case 'increment':
          return state + 1;
        case 'decrement':
          return state - 1;
        default:
          return state;
      }
    }

    function enhancer (createStore) {
      return function (reducer, preloadedState) {
        var store = createStore(reducer, preloadedState);
        var dispatch = store.dispatch;
        function _dispatch (action) {
          if (typeof action === 'function') {
            return action(dispatch)
          }
          dispatch(action);
        }
        return {
          ...store,
          dispatch: _dispatch
        }
      }
    }

    const routerReducer = combineReducers({ counter: reducer })

    const store = createStore(routerReducer, { counter: 100 }, applyMiddleware(logger, thunk))
    console.log(store.getState())

    store.subscribe(function() {
      document.getElementById('count').innerHTML = store.getState().counter
    })

    const actions = bindActionCreators({ increment, decrement }, store.dispatch)

    function increment() {
      return { type: 'increment' }
    }

    function decrement () {
      return { type: 'decrement' }
    }


    document.getElementById('increment').onclick = function () {
      actions.increment()
      // store.dispatch({type: 'increment'})
      // store.dispatch(function(dispatch) {
      //   setTimeout(function() {
      //     dispatch({type: 'increment'})
      //   }, 1000)
      // })
    }

    document.getElementById('decrement').onclick = function () {
      // store.dispatch({type: 'decrement'})
      actions.decrement()
    }
  </script>
</body>
</html>